mark sys_open/sys_read exports unused

sys_open / sys_read were used in the early 1.2 days to load firmware from
disk inside drivers.  Since 2.0 or so this was deprecated behavior, but
several drivers still were using this.  Since a few years we have a
request_firmware() API that implements this in a nice, consistent way.
Only some old ISA sound drivers (pre-ALSA) still straggled along for some
time....  however with commit c2b1239a9f the
last user is now gone.

This is a good thing, since using sys_open / sys_read etc for firmware is a
very buggy to dangerous thing to do; these operations put an fd in the
process file descriptor table....  which then can be tampered with from
other threads for example.  For those who don't want the firmware loader,
filp_open()/vfs_read are the better APIs to use, without this security
issue.

The patch below marks sys_open and sys_read unused now that they're
really not used anymore, and for deletion in the 2.6.25 timeframe.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/open.c

@@ -1061,7 +1061,7 @@ asmlinkage long sys_open(const char __user *filename, int flags, int mode)
 	prevent_tail_call(ret);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(sys_open);
+EXPORT_UNUSED_SYMBOL_GPL(sys_open); /* To be deleted for 2.6.25 */
 
 asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
 			   int mode)

fs/read_write.c

@@ -370,7 +370,7 @@ asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(sys_read);
+EXPORT_UNUSED_SYMBOL_GPL(sys_read); /* to be deleted for 2.6.25 */
 
 asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count)
 {